Onboard Seismic Source and Data Quality Control Software
Real–time QC is onboard seismic source and data quality control as soon as the data is received during marine seismic acquisition. It is aimed to identify any problems with seismic acquisition at the very same moment when they happen. This allows seismic crew fixing the problems immediately, minimizing related loss of operational time and money. Nowadays RT QC is the industry standard for marine seismic operations.
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Details
Typical real–time QC products include the following:
- Source control products: near–field hydrophone signature, bubble peak amplitude, time and period maps and plots, source towing depth plots, flip–flop source identity plots.
- Data control products: shot gathers, near–trace gathers, SOR/EOR/TARGET RMS amplitude maps, signal–to–noise ratio map, real–time 2D CMP/CSS stacks, frequency plots.
This set of products helps to control most of things happening on board related to seismic acquisition. By monitoring them, QC personnel and/or observers can easily identify out-of-spec issues like bad shots, dead or weak channels, source air leakages, misfires, flip–flop source identity loss, low signal–to–noise ratio, strong noises, etc. Many of these issues require immediate action and reporting.
How Does It Work?
The software runs on a PC, saving processing time of your server nodes. It connects to the data storage and input a shot record as soon as it is written. Each shot is read only once, to avoid network overload. After a shot is loaded into the local RAM of the PC, it is input to the pre–defined QC flows that all run in parallel locally. All real–time displays run and update locally as well, without slowing down the network.
This, along with the optimized processing algorithms, allows QC of the data from thousands of channels in true real–time, (typical delays are less than 1 minute) using just an good modern PC with a multi–core CPU, 64–bit Windows OS and several monitors. Compare this to some conventional QC packages, which claim to be real–time, while in practice have dozens of shots delayed even when working on a powerful Linux cluster…
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